retired academic couple, mid-60s, moving to Sac from Midwest

We'll be in Mangin Park, near the Executive Airport. We've visited, but never stayed for long. Suggestions about where to go and what to do for newbies settling in? We're homebodies tbh. We like culture, cafes, libraries, lap-pools, weekend excursions. We're a bit nervous. General info? Things we should already have done? Opportunities for folks our age?